vtophys.cc revision 1111 
1/*
2 * Copyright (c) 2002-2004 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <string>
30
31#include "arch/alpha/vtophys.hh"
32#include "base/trace.hh"
33#include "cpu/exec_context.hh"
34#include "mem/functional_mem/physical_memory.hh"
35
36using namespace std;
37
38AlphaISA::PageTableEntry
39kernel_pte_lookup(PhysicalMemory *pmem, Addr ptbr, AlphaISA::VAddr vaddr)
40{
41    Addr level1_pte = ptbr + vaddr.level1();
42    AlphaISA::PageTableEntry level1 = pmem->phys_read_qword(level1_pte);
43    if (!level1.valid()) {
44        DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
45        return 0;
46    }
47
48    Addr level2_pte = level1.paddr() + vaddr.level2();
49    AlphaISA::PageTableEntry level2 = pmem->phys_read_qword(level2_pte);
50    if (!level2.valid()) {
51        DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
52        return 0;
53    }
54
55    Addr level3_pte = level2.paddr() + vaddr.level3();
56    AlphaISA::PageTableEntry level3 = pmem->phys_read_qword(level3_pte);
57    if (!level3.valid()) {
58        DPRINTF(VtoPhys, "level 3 PTE not valid, va = %#x\n", vaddr);
59        return 0;
60    }
61    return level3;
62}
63
64Addr
65vtophys(PhysicalMemory *xc, Addr vaddr)
66{
67    Addr paddr = 0;
68    if (AlphaISA::IsUSeg(vaddr))
69        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
70    else if (AlphaISA::IsK0Seg(vaddr))
71        paddr = AlphaISA::K0Seg2Phys(vaddr);
72    else
73        panic("vtophys: ptbr is not set on virtual lookup");
74
75    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
76
77    return paddr;
78}
79
80Addr
81vtophys(ExecContext *xc, Addr addr)
82{
83    AlphaISA::VAddr vaddr = addr;
84    Addr ptbr = xc->regs.ipr[AlphaISA::IPR_PALtemp20];
85    Addr paddr = 0;
86    //@todo Andrew couldn't remember why he commented some of this code
87    //so I put it back in. Perhaps something to do with gdb debugging?
88    if (PC_PAL(vaddr) && (vaddr < PAL_MAX)) {
89        paddr = vaddr & ~ULL(1);
90    } else {
91        if (AlphaISA::IsK0Seg(vaddr)) {
92            paddr = AlphaISA::K0Seg2Phys(vaddr);
93        } else if (!ptbr) {
94            paddr = vaddr;
95        } else {
96            AlphaISA::PageTableEntry pte =
97                kernel_pte_lookup(xc->physmem, ptbr, vaddr);
98            if (pte.valid())
99                paddr = pte.paddr() | vaddr.offset();
100        }
101    }
102
103
104    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
105
106    return paddr;
107}
108
109uint8_t *
110ptomem(ExecContext *xc, Addr paddr, size_t len)
111{
112    return xc->physmem->dma_addr(paddr, len);
113}
114
115uint8_t *
116vtomem(ExecContext *xc, Addr vaddr, size_t len)
117{
118    Addr paddr = vtophys(xc, vaddr);
119    return xc->physmem->dma_addr(paddr, len);
120}
121
122void
123CopyOut(ExecContext *xc, void *dest, Addr src, size_t cplen)
124{
125    Addr paddr;
126    char *dmaaddr;
127    char *dst = (char *)dest;
128    int len;
129
130    paddr = vtophys(xc, src);
131    len = min((int)(AlphaISA::PageBytes - (paddr & AlphaISA::PageOffset)),
132              (int)cplen);
133    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
134    assert(dmaaddr);
135
136    memcpy(dst, dmaaddr, len);
137    if (len == cplen)
138        return;
139
140    cplen -= len;
141    dst += len;
142    src += len;
143
144    while (cplen > AlphaISA::PageBytes) {
145        paddr = vtophys(xc, src);
146        dmaaddr = (char *)xc->physmem->dma_addr(paddr, AlphaISA::PageBytes);
147        assert(dmaaddr);
148
149        memcpy(dst, dmaaddr, AlphaISA::PageBytes);
150        cplen -= AlphaISA::PageBytes;
151        dst += AlphaISA::PageBytes;
152        src += AlphaISA::PageBytes;
153    }
154
155    if (cplen > 0) {
156        paddr = vtophys(xc, src);
157        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
158        assert(dmaaddr);
159
160        memcpy(dst, dmaaddr, cplen);
161    }
162}
163
164void
165CopyIn(ExecContext *xc, Addr dest, void *source, size_t cplen)
166{
167    Addr paddr;
168    char *dmaaddr;
169    char *src = (char *)source;
170    int len;
171
172    paddr = vtophys(xc, dest);
173    len = min((int)(AlphaISA::PageBytes - (paddr & AlphaISA::PageOffset)),
174              (int)cplen);
175    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
176    assert(dmaaddr);
177
178    memcpy(dmaaddr, src, len);
179    if (len == cplen)
180        return;
181
182    cplen -= len;
183    src += len;
184    dest += len;
185
186    while (cplen > AlphaISA::PageBytes) {
187        paddr = vtophys(xc, dest);
188        dmaaddr = (char *)xc->physmem->dma_addr(paddr, AlphaISA::PageBytes);
189        assert(dmaaddr);
190
191        memcpy(dmaaddr, src, AlphaISA::PageBytes);
192        cplen -= AlphaISA::PageBytes;
193        src += AlphaISA::PageBytes;
194        dest += AlphaISA::PageBytes;
195    }
196
197    if (cplen > 0) {
198        paddr = vtophys(xc, dest);
199        dmaaddr = (char *)xc->physmem->dma_addr(paddr, cplen);
200        assert(dmaaddr);
201
202        memcpy(dmaaddr, src, cplen);
203    }
204}
205
206void
207CopyString(ExecContext *xc, char *dst, Addr vaddr, size_t maxlen)
208{
209    Addr paddr;
210    char *dmaaddr;
211    int len;
212
213    paddr = vtophys(xc, vaddr);
214    len = min((int)(AlphaISA::PageBytes - (paddr & AlphaISA::PageOffset)),
215              (int)maxlen);
216    dmaaddr = (char *)xc->physmem->dma_addr(paddr, len);
217    assert(dmaaddr);
218
219    char *term = (char *)memchr(dmaaddr, 0, len);
220    if (term)
221        len = term - dmaaddr + 1;
222
223    memcpy(dst, dmaaddr, len);
224
225    if (term || len == maxlen)
226        return;
227
228    maxlen -= len;
229    dst += len;
230    vaddr += len;
231
232    while (maxlen > AlphaISA::PageBytes) {
233        paddr = vtophys(xc, vaddr);
234        dmaaddr = (char *)xc->physmem->dma_addr(paddr, AlphaISA::PageBytes);
235        assert(dmaaddr);
236
237        char *term = (char *)memchr(dmaaddr, 0, AlphaISA::PageBytes);
238        len = term ? (term - dmaaddr + 1) : AlphaISA::PageBytes;
239
240        memcpy(dst, dmaaddr, len);
241        if (term)
242            return;
243
244        maxlen -= AlphaISA::PageBytes;
245        dst += AlphaISA::PageBytes;
246        vaddr += AlphaISA::PageBytes;
247    }
248
249    if (maxlen > 0) {
250        paddr = vtophys(xc, vaddr);
251        dmaaddr = (char *)xc->physmem->dma_addr(paddr, maxlen);
252        assert(dmaaddr);
253
254        char *term = (char *)memchr(dmaaddr, 0, maxlen);
255        len = term ? (term - dmaaddr + 1) : maxlen;
256
257        memcpy(dst, dmaaddr, len);
258
259        maxlen -= len;
260    }
261
262    if (maxlen == 0)
263        dst[maxlen] = '\0';
264}
265